feat(api): add validation for connect account request

src/FiscalOS.API/Accounts/Connect/Endpoint.cs

@@ -9,7 +9,9 @@ internal static class Endpoint
     return groupBuilder.MapPost(Route, HandleAsync);
   }
 
-  private static async Task<IResult> HandleAsync()
+  private static async Task<IResult> HandleAsync(
+    [FromBody] Request request
+  )
   {
     return Results.Ok();
   }

src/FiscalOS.API/Accounts/Connect/Request.cs

@@ -0,0 +1,22 @@
+namespace FiscalOS.API.Accounts.Connect;
+
+public record Request : IValidatableObject
+{
+  public string PublicToken { get; init; } = string.Empty;
+  public string PlaidInstitutionId { get; init; } = string.Empty;
+
+  public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
+  {
+    if (string.IsNullOrWhiteSpace(PublicToken))
+    {
+      var fieldName = nameof(PublicToken);
+      yield return new($"The {fieldName} field is required.", [fieldName]);
+    }
+
+    if (string.IsNullOrWhiteSpace(PlaidInstitutionId))
+    {
+      var fieldName = nameof(PlaidInstitutionId);
+      yield return new($"The {fieldName} field is required.", [fieldName]);
+    }
+  }
+}